CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Agency MBS pledged to counterparties at fair value	$ 3,834,344,000	$ 4,278,797,000
Series B Cumulative Convertible Preferred Stock, par value	$ 0.01	$ 0.01
Series B Cumulative Convertible Preferred Stock, liquidating preference per share	$ 25.00	$ 25.00
Series B Cumulative Convertible Preferred Stock, liquidating preference	$ 19,494,000	$ 19,494,000
Series B Cumulative Convertible Preferred Stock, shares issued	779,743	780,000
Series B Cumulative Convertible Preferred Stock, shares outstanding	780,000	780,000
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, authorized	200,000,000	200,000,000
Common Stock, issued	98,303,913	98,137,000
Common Stock, outstanding	98,303,913	98,137,000
Total assets	$ 5,318,950,000	$ 5,765,541,000
Accrued interest receivable	17,272,000	18,091,000
Total liabilities	4,677,649,000	5,068,119,000
Accrued interest payable	21,881,000	15,835,000
Agency MBS
Agency MBS pledged to counterparties at fair value	3,691,061,000	4,073,852,000
Non-Agency MBS
Agency MBS pledged to counterparties at fair value	$ 686,962,000	$ 661,445,000
Series A Preferred Stock
Cumulative Preferred Stock, par value	$ 0.01	$ 0.01
Cumulative Preferred Stock, liquidating preference per share	$ 25.00	$ 25.00
Cumulative Preferred Stock, liquidating preference	$ 47,984,000	$ 47,984,000
Cumulative Preferred Stock, shares issued	1,919,378
Cumulative Preferred Stock, shares outstanding	1,919,378	1,919,378
Series C Preferred Stock
Cumulative Preferred Stock, par value	$ 0.01	$ 0.01
Cumulative Preferred Stock, liquidating preference per share	$ 25.00	$ 25.00
Cumulative Preferred Stock, liquidating preference	$ 50,257,000	$ 49,725,000
Cumulative Preferred Stock, shares issued	2,010,278	1,989,000
Cumulative Preferred Stock, shares outstanding	2,010,278	1,989,000
Variable Interest Entities Primary Beneficiary
Total assets	$ 587,000,000	$ 641,000,000
Accrued interest receivable	1,900,000	2,100,000
Total liabilities	578,000,000	632,000,000
Accrued interest payable	$ 1,900,000	$ 2,000,000